Comparison between the thermal properties of fully dense and porous NiTi SMAs

Zanotti, C.; Giuliani, P.; Bassani, Paola; Zhang, Zhenxue; Chrysanthou, A.

doi:10.1016/j.intermet.2009.06.001

Cited by 34 publications

(29 citation statements)

References 16 publications

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“…In this study, it is seen that the thermal conductivities of the porous specimens are lower than that of the solid specimen. Similar results were determined by Zanotti et al [20], for which the thermal conductivity decreased with increasing porosity. They determined that the thermal conductivity for porous NiTi with a porosity of 68 %, 48 %, and 30 % were about (4, 3, and 2) W · m −1 · K −1 , respectively.…”

Section: Time (Min)supporting

confidence: 90%

Effect of Solution Treatment on Thermal Conductivity of Porous NiTi Shape Memory Alloy

2011

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In this study, a new solution treatment "solution treatment under loading" was applied to a porous Ni-50 at.%Ti shape memory alloy (SMA), which was fabricated by self-propagating high-temperature synthesis (SHS), to explore the microstructural improvement regarding single-phase NiTi. The effects of solution treatment under loading and without loading on the phase constituent and thermal conductivity were investigated and discussed. The phase constituent and thermal conductivity of the specimens considerably changed with solution treatment under loading, but they were not affected significantly with solution treatment without loading. Intermetallic phases such as B19 (NiTi), Ti 2 Ni, and Ni 4 Ti 3 disappeared, the density of the B2(NiTi) phase increased with solution treatment under loading, and thus the thermal conductivity was increased. It was also seen that the thermal conductivity of porous NiTi was less than that of solid NiTi.

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Section: Time (Min)supporting

confidence: 90%

Effect of Solution Treatment on Thermal Conductivity of Porous NiTi Shape Memory Alloy

2011

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“…For this study, the temperature dependent thermal conductivity and heat capacity parameters are obtained from different experimental studies [55][56][57]. For the D2Q9 lattice system, the equilibrium distribution function of heat energy is expressed as [58,59] ( ) ( ) ( ) …”

Section: Lattice Boltzmann (Lb) Methods For Heat Transfermentioning

confidence: 99%

Linking simulations and experiments for the multiscale tracking of thermally induced martensitic phase transformation in NiTi SMA

Gur

Frantziskonis

2016

Modelling Simul. Mater. Sci. Eng.

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Martensitic phase transformation in NiTi shape memory alloys (SMA) occurs over a hierarchy of spatial scales, as evidenced from observed multiscale patterns of the martensitic phase fraction, which depend on the material microstructure and on the size of the SMA specimen. This paper presents a methodology for the multiscale tracking of the thermally induced martensitic phase transformation process in NiTi SMA. Fine scale stochastic phase field simulations are coupled to macroscale experimental measurements through the compound wavelet matrix method (CWM). A novel process for obtaining CWM fine scale wavelet coefficients is used that enhances the effectiveness of the method in transferring uncertainties from fine to coarse scales, and also ensures the preservation of spatial correlations in the phase fraction pattern. Size effects, well-documented in the literature, play an important role in designing the multiscale tracking methodology. Molecular dynamics (MD) simulations are employed to verify the phase field simulations in terms of different statistical measures and to demonstrate size effects at the nanometer scale. The effects of thermally induced martensite phase fraction uncertainties on the constitutive response of NiTi SMA is demonstrated.

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“…Literature is abundant on the role of soil water content, bulk density, mineralogical composition and organic content on thermal conductivity of soils, especially in the soil sciences discipline [12,11,10,45,46]. From the literature of pelotherapy, cosmetics, and pharmacy, comparative studies on cooling properties of various minerals are found [47].…”

Section: Active Thermoregulatory Behavior Of Skinmentioning

confidence: 99%